|Date|Name of ship|Nationality|Tonnage|Fate|
|---|---|---|---|---|
|5 June 1940|SS Stancor|United Kingdom|798|Sunk at 58°48′N 08°45′W﻿ / ﻿58.800°N 8.750°W|
|7 June 1940|SS Frances Massey|United Kingdom|4,212|Sunk at 55°33′N 08°26′W﻿ / ﻿55.550°N 8.433°W|
|7 June 1940|SS Eros|United Kingdom|5,888|Damaged at 55°33′N 08°26′W﻿ / ﻿55.550°N 8.433°W|
|11 June 1940|SS Violando N Goulandris|Greece|2,375|Sunk at 44°04′N 12°30′W﻿ / ﻿44.067°N 12.500°W|
|19 June 1940|MV Tudor|Norway|6,607|Sunk at 45°10′N 11°50′W﻿ / ﻿45.167°N 11.833°W|
|19 June 1940|SS Baron Loudoun|United Kingdom|3,164|Sunk at 45°00′N 11°21′W﻿ / ﻿45.000°N 11.350°W|
|19 June 1940|SS British Monarch|United Kingdom|5,661|Sunk at 45°00′N 11°21′W﻿ / ﻿45.000°N 11.350°W|
|20 June 1940|MV Moerdrecht|Netherlands|7,493|Sunk at 43°34′N 14°20′W﻿ / ﻿43.567°N 14.333°W|
|16 August 1940|SS Hedrun|Sweden|2,325|Sunk at 57°10′N 16°37′W﻿ / ﻿57.167°N 16.617°W|
|19 August 1940|SS Ville de Gand|Belgium|7,590|Sunk at 55°28′N 15°10′W﻿ / ﻿55.467°N 15.167°W|
|24 August 1940|SS La Brea|United Kingdom|6,666|Sunk at 57°24′N 11°21′W﻿ / ﻿57.400°N 11.350°W|
|25 August 1940|SS Empire Merlin|United Kingdom|5,763|Sunk at 58°30′N 10°15′W﻿ / ﻿58.500°N 10.250°W|
|25 August 1940|MV Athelcrest|United Kingdom|6,825|Sunk at 58°24′N 11°25′W﻿ / ﻿58.400°N 11.417°W|

Question: what is the difference in tonnage between the heaviest and the lightest ships?
Answer: 6792